title: Prediction of functional aerobic capacity without exercise testing.
abstract: The purpose of this study was to develop functional aerobic capacity prediction models without using exercise tests (N-Ex) and to compare the accuracy with Astrand single-stage submaximal prediction methods. The data of 2,009 subjects (9.7% female) were randomly divided into validation (N = 1,543) and cross-validation (N = 466) samples. The validation sample was used to develop two N-Ex models to estimate VO2peak. Gender, age, body composition, and self-report activity were used to develop two N-Ex prediction models. One model estimated percent fat from skinfolds (N-Ex %fat) and the other used body mass index (N-Ex BMI) to represent body composition. The multiple correlations for the developed models were R = 0.81 (SE = 5.3 ml.kg-1.min-1) and R = 0.78 (SE = 5.6 ml.kg-1.min-1). This accuracy was confirmed when applied to the cross-validation sample. The N-Ex models were more accurate than what was obtained from VO2peak estimated from the Astrand prediction models. The SEs of the Astrand models ranged from 5.5-9.7 ml.kg-1.min-1. The N-Ex models were cross-validated on 59 men on hypertensive medication and 71 men who were found to have a positive exercise ECG. The SEs of the N-Ex models ranged from 4.6-5.4 ml.kg-1.min-1 with these subjects.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Cardiopulmonary Laboratory, NASA/Johnson Space Center, Houston, TX 77058.
authors.forename: A S
authors.initials: AS
authors.lastname: Jackson
authors.forename: S N
authors.initials: SN
authors.lastname: Blair
authors.forename: M T
authors.initials: MT
authors.lastname: Mahar
authors.forename: L T
authors.initials: LT
authors.lastname: Wier
authors.forename: R M
authors.initials: RM
authors.lastname: Ross
authors.forename: J E
authors.initials: JE
authors.lastname: Stuteville
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001823:Body Composition; D002320:Cardiovascular Physiological Phenomena; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D010101:Oxygen Consumption; D012044:Regression Analysis; D012737:Sex Factors